Add shufflings test (#3050)

packages/beacon-state-transition/test/perf/allForks/util/shufflings.test.ts

@@ -0,0 +1,41 @@
+import {itBench} from "@dapplion/benchmark";
+import {Epoch} from "@chainsafe/lodestar-types";
+import {allForks, computeEpochAtSlot} from "../../../../src";
+import {computeEpochShuffling, computeProposers} from "../../../../src/allForks";
+import {generatePerfTestCachedStatePhase0, numValidators} from "../../util";
+import {getNextSyncCommittee} from "../../../../src/altair/util/syncCommittee";
+
+describe("epoch shufflings", () => {
+  let state: allForks.CachedBeaconState<allForks.BeaconState>;
+  let nextEpoch: Epoch;
+
+  before(function () {
+    this.timeout(60 * 1000);
+    state = generatePerfTestCachedStatePhase0() as allForks.CachedBeaconState<allForks.BeaconState>;
+    nextEpoch = computeEpochAtSlot(state.slot) + 1;
+
+    // Sanity check to ensure numValidators doesn't go stale
+    if (state.validators.length !== numValidators) throw Error("constant numValidators is wrong");
+  });
+
+  itBench({
+    id: `computeProposers - vc ${numValidators}`,
+    fn: () => {
+      computeProposers(state, state.epochCtx.nextShuffling);
+    },
+  });
+
+  itBench({
+    id: `computeEpochShuffling - vc ${numValidators}`,
+    fn: () => {
+      computeEpochShuffling(state, state.epochCtx.nextShuffling.activeIndices, nextEpoch);
+    },
+  });
+
+  itBench({
+    id: `getNextSyncCommittee - vc ${numValidators}`,
+    fn: () => {
+      getNextSyncCommittee(state, state.epochCtx.nextShuffling.activeIndices);
+    },
+  });
+});